BySlideMenu is a plugin for Mootools which allow you to easily create a beautiful accordion menu (sliding menu) on any element you want using images and/or text. It works horizontally or vertically. Menu can be pinned or not, by mouseover or click. It’s totally free. You can download it, modify it and use it in any commercial project as long as you respect the license. It’s Open Source!

If you like this plugin, you should take a look at Phatfusion Image Menu as well.

Requirements: Mootools Framework
Demo: http://www.byscripts.info/scripts/javascript-dynamic-accordion-menu
License: MIT License